G-SYNC 101: Control Panel


G-SYNC Module

The G-SYNC module is a small chip that replaces the display’s standard internal scaler, and contains enough onboard memory to hold and process a single frame at a time.

The module exploits the vertical blanking interval (the span between the previous and next frame scan) to manipulate the display’s internal timings; performing G2G (gray to gray) overdrive calculations to prevent ghosting, and synchronizing the display’s refresh rate to the GPU’s render rate to eliminate tearing, along with the delayed frame delivery and adjoining stutter caused by traditional syncing methods.

G-SYNC Demo

The below Blur Busters Test UFO motion test pattern uses motion interpolation techniques to simulate the seamless framerate transitions G-SYNC provides within the refresh rate, when directly compared to standalone V-SYNC.

G-SYNC Activation

“Enable for full screen mode” (exclusive fullscreen functionality only) will automatically engage when a supported display is connected to the GPU. If G-SYNC behavior is suspect or non-functioning, untick the “Enable G-SYNC, G-SYNC Compatible” box, apply, re-tick, and apply.

Blur Buster's G-SYNC 101: Control Panel

G-SYNC Windowed Mode

“Enable for windowed and full screen mode” allows G-SYNC support for windowed and borderless windowed mode. This option was introduced in a 2015 driver update, and by manipulating the DWM (Desktop Windows Manager) framebuffer, enables G-SYNC’s VRR (variable refresh rate) to synchronize to the focused window’s render rate; unfocused windows remain at the desktop’s fixed refresh rate until focused on.

G-SYNC only functions on one window at a time, and thus any unfocused window that contains moving content will appear to stutter or slow down, a reason why a variety of non-gaming applications (popular web browsers among them) include predefined Nvidia profiles that disable G-SYNC support.

Note: this setting may require a game or system restart after application; the “G-SYNC Indicator” (Nvidia Control Panel > Display > G-SYNC Indicator) can be enabled to verify it is working as intended.

G-SYNC Preferred Refresh Rate

“Highest available” automatically engages when G-SYNC is enabled, and overrides the in-game refresh rate selector (if present), defaulting to the highest supported refresh rate of the display. This is useful for games that don’t include a selector, and ensures the display’s native refresh rate is utilized.

“Application-controlled” adheres to the desktop’s current refresh rate, or defers control to games that contain a refresh rate selector.

Note: this setting only applies to games being run in exclusive fullscreen mode. For games being run in borderless or windowed mode, the desktop dictates the refresh rate.

G-SYNC & V-SYNC

G-SYNC (GPU Synchronization) works on the same principle as double buffer V-SYNC; buffer A begins to render frame A, and upon completion, scans it to the display. Meanwhile, as buffer A finishes scanning its first frame, buffer B begins to render frame B, and upon completion, scans it to the display, repeat.

The primary difference between G-SYNC and V-SYNC is the method in which rendered frames are synchronized. With V-SYNC, the GPU’s render rate is synchronized to the fixed refresh rate of the display. With G-SYNC, the display’s VRR (variable refresh rate) is synchronized to the GPU’s render rate.

Upon its release, G-SYNC’s ability to fall back on fixed refresh rate V-SYNC behavior when exceeding the maximum refresh rate of the display was built-in and non-optional. A 2015 driver update later exposed the option.

This update led to recurring confusion, creating a misconception that G-SYNC and V-SYNC are entirely separate options. However, with G-SYNC enabled, the “Vertical sync” option in the control panel no longer acts as V-SYNC, and actually dictates whether, one, the G-SYNC module compensates for frametime variances output by the system (which prevents tearing at all times. G-SYNC + V-SYNC “Off” disables this behavior; see G-SYNC 101: Range), and two, whether G-SYNC falls back on fixed refresh rate V-SYNC behavior; if V-SYNC is “On,” G-SYNC will revert to V-SYNC behavior above its range, if V-SYNC is “Off,” G-SYNC will disable above its range, and tearing will begin display wide.

Within its range, G-SYNC is the only syncing method active, no matter the V-SYNC “On” or “Off” setting.

Currently, when G-SYNC is enabled, the control panel’s “Vertical sync” entry is automatically engaged to “Use the 3D application setting,” which defers V-SYNC fallback behavior and frametime compensation control to the in-game V-SYNC option. This can be manually overridden by changing the “Vertical sync” entry in the control panel to “Off,” “On,” or “Fast.”



2532 Comments For “G-SYNC 101”

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Cask
Member
Cask

Good guide!

What should my – fps be set to on a 175hz monitor with G-Sync + V-Sync + Max refresh rate cap in NVCP? -3 still?

xJB
Member
xJB

Greetings thanks for the guide, I have a question. What do I do if the game feels choppy on locked 60 fps with a 165 Hz monitor (G-SYNC) and if there is a way to make 60 fps smooth playing games on a 165 Hz g-sync monitor Please do tell. Thanks

dandyjr
Member
dandyjr

Hello, I’ve found another potential issue that came from an emulator developer (specifically Ryujinx) that claimed that their “guest Vsync” that’s built into the emulator has frame pacing issues when used in conjunction with VRR. From a technical standpoint, I don’t see how that could be at all possible. I’m not sure if you’re familiar with guest Vsync but it seems to emulate a console’s Vsync but somehow does not eliminate screen tearing on PC. It only seems to lock the game to the native framerate the game runs at on the Switch. Have you had any experience with this and what would your recommendation be for using G-SYNC in these instances?

YoloHolo
Member
YoloHolo

Hello, I think I you may have solved the issue I have been having. I was about to go insane.

Issue = Screen turning on and off (going black) quickly in game or in game menu.

Monitor = ASUS PG32UQ running 120Hz via HDMI 2.1 on a NVIDIA 4090

Resolution = Gsync on in NVIDIA Control Panel and Freesync Premium Pro on Monitor Settings + VSync on through NVIDIA Control Panel but off in game + In game refresh rate set to 120 + FPS Limit in game set to 117.

I am playing Modern Warfare 2 and so far no issues. I am assuming all my problems are now gone?

Thank you.

YoloHolo
Member
YoloHolo

Ok, so the fps limit might not be the reason I am not getting the black screen flicker anymore as I also unplugged my second monitor which even though was turned off/clicked show only main monitor. I think unplugging may have fixed the issue.

omeerkrks1
Member
omeerkrks1

hello I have a 165 hz monitor but sometimes my frame rate drops below 165 hz what should I do on low latency mode or ultra ?

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